Roller grinding-mill



L(N0 Model.) 2 sheets-sheet 2.

G. T; HANNA,

- ROLLER GBINDING MILL.

No. 272mm. l Patented Peb. 13, 13a-s.

O lI s R ,i lol M. PETERS. PhMbLiihognpMr, Wambel. D C

UNITED STATES PATENT Ormea.

cYRUs fr. HANNA, or ALLEGHENY, PENNSYLVANIA.

ROLLER GRINDING-MILL.

SEGIFICATION forming part of Letters Patent No. 272,043, dated February 13, 1883.

Application filed September 9, 1882. (No model.)

To all whom it may concern Be it known that I, Ovens T. HANNA, a

' citizen of the United States, residing atAllegheny, county of Allegheny, State of Pennsylvania, have invented or discovered a new and usel'ul Improvement in Roller Grinding-Mills; Iand I do hereby declare the following to be a full, clear, concise, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in whichlike letters indicating like parts- Figurel, Sheet l, shows an end elevation, partly in section, ot' my improved roller-mill.

Fig.2 is an enlarged view of the parts shownV in section in Fig. l, Fig. 3 is a transverse sectional View of one bearing, such section being taken in the plane of thelinew, Fig. 2. Fig. 4. illustrates a coupling connection or device employedfor throwingtherollsiuto land out of working relation. Fig. 5, Sheet 2, is a verti` cal sectional view of a part of the wooden case and some of the` operative parts illustrativeot detailsin construction. Fig. 6 shows detached parts of the scraper mechanism employed. Fig. 7 shows parts of an automatic feed-gate employed in my improved machine; and Fig.

. rolls, for regulating the feed-supply to the rolls,

for driving the rolls, and tor preventing accumulation of meal thereon, as hereinafter more fully described and claimed.

In the drawings, A represents a cast-iron frame-work,which maybe of any suitable form, having bed-rails A oneither side for support ot' two or more sets of rolls, B B' and D D.

Upon the upper faces of these rails are formed inclined faces or seats a a-two for each rollbearing-which terminate at their depressed ends by abrupt shoulders a. Adjustable or sliding wedge plates` c, having correspondinglyinclined under faces, c c', are seated on the inclines a a, and support or carry the pillow-blocks b b, the latter being connected to |/the frame by bolts b2 b2, which pass through enlarged holes or slots b3 in the bed and wedge plates and screw into the under faces of the pillow-blocks. Screw-bolts a2 are employed to move the wed ges longitudinally, and thus raise either or both ends of the rolls for the usual purposes of adjustment. These fea tures of construction are substantially the same asin the prior patent to me4 above re ferred to, and therefore need not be again described in detail.

In my present invention I m alre connection between the pillow-blocks b of the rolls and the wedge-plates c by means of longitudinal grooves c2 in each wedge-plate, havinga concave or hollowed bottom curved transversely or across the groove, as illustrated in Fig. 3, and tongues b on the 4pillow-blocks having a correspondingly-rounded under face, adapted in form to take afull bearing upon the bottom ofthe grooves Athrough a short range ot' rocling motion of the pil1ow-blocks-such, for example, as would be imparted by raising or lowering the ends of the rolls nnequally. If the bearing-faces between the tongues and grooves were dat, such tipping would cause the tongues to rest on one edge, and thereby decrease their stability, and, perhaps, to hind in the grooves; also, the small openings under the raised edges would become clogged and obstructed with dust. By rounding these bearing-faces, as shown and described, such dittlculties are ob,- viated and a full bearingcontact is secured through the whole range ot' adjustments required in practice.

In order to adjust the rolls horizontally, I

make use of substantially the samedevices as shown and described in my prior patent, No. 253,698,1)ut have introduced therewith certain features of improvement. sist of threaded rods @,which are passed through corner uprights A3, and screwed into the pillow-blocks-one in each-in the central plane of the roll-bearings. Each of these rods is also These devices conpassed through an eXteriorly-threaded sleeve,

c', and a coiled spring, e2, surrounds both the sleeve and rod and bears at one end upon the pillow-block b, and at the other end `upon a double nut, e3.screwed on the sleeve. By turning these nuts the pressure ofthe springs upon the pillow'blocks may be regulated at pleasure. A similar double-nut, e4, is also IOO screwed on the outer end of rod e, by turning l different speed, the fast rolls being representv which the rolls B D may be adjusted toward or, from the fixed rolls B D' at pleasure, the

movable rolls being held up to Working positipn by the pressure of springs e2. In order to remove the rolls B D without disturbing the working adjustment secured by rods e. camshaped sleeves e6 are formed on the sides of collars e5, which collars are secured on the rods as againstlongitudinal movement thereon, but

' are free to turn circu mferentiall y. Also, a corresponding cam-face, e7, is made on the end of each sleeve 6. By turning the cams c6 with leverse, the ends of thesleeves e beingscrewed tast in the standards A3, the rods e and pillowblocksb will be given horizontal movement corresponding tothe pitch or elevation ot'cams es el; or, in other words7 the rolls may be drawn outward against the springs e2 when 'not at work by turning the cam-projections upon each other; or, by turning them so that the elevations of one register with the depressions of the other, the springs e2 will force'the rolls vinto such Working` relation as may previously have been determined by the rods e.

In order to coverthese cams e6 e", and thereby protect them from dust, dirt, and other foreign matter which might adhere to the cami'aces and disturb the feed adjustment, I have placed them Within suitable chambers or recesses madein the standards A3; or,as an equivalent construction, hoods, boxes, or other suitable covers may be secured to the standards in proper position to inclose the cams, and thereby aiiord the desired protection. 1n the prior patent to me these cams are uncovered and exposed to dust,.dirt, and injury. In my present improvement they are effectually protected Without increasing the cost of construction. This vin practice will materially increase the etiiciency and uniformity of feed adjustment in this class of machines. In order to prevent injurious contact ofthe rolls, I cast projecting pins or lugs den each of the fixed pillow-blocks oftherollsBD/,which extend toward themovable blocks ofthe rolls B D, by preference in the central vertical plane ot' the roll-bed or base of the pillow-blocks, and they are made of such length byaccurate iilingorother trimmingthat whentheir outer ends abutagainst themovable blocks ofthe rolls B D the rolls shall be in the closest adjustment practicable without injury bycontact. Heretoioreadjustablescrew-stops have been used which. areliable to be disturbed or moved by the constant tremor and jarring of the machine. With my improved construction ot' stops no such disturbance is possible. The stop is rigid, certain, and fixed, and by bearin g in the vertical central plane of the rollbearin gs there is no tendency to tip the pillowblocks by pressure upon the stops. The rolls are driven by belts n-one on either end of the frame-which are run from counter-shaft pulleyI N over pulleys NN (see Fig. 8) on the ends of the roll-shafts. Each belt drives two rollsone in each set, as shownand they Yare geared to drive their respective rolls at ed by double-arrows and the slow rolls by single arrows.

In order to keep the belts at Vproper tension I make use of tightening-pulleys H-one Vfor each belt-which are arranged to bear upon the belts between the counter-shaft pulleys N and roll-pulleys N. The tigh tening-pulleys H are supported ou endwise-movable bars h, which have bearings h on the frame. The bars are given endwise adjustment by means of a hand-screw, H', so as to tighten or loosen the pulleys upon the belts. The horizontal movement ot' the rolls B D above described tends to tighten and strain the driving-belts; and, in order to counteract such tendency or to prevent injury therefrom, I seat a coiled spring, h2, between the adj usting-screw H and the frame, so that increased strain upon the belt will compress the spring and afford re- 'liet by easing the tightening-pulley.

In order to regulate/ the feed or supply of grain to the rolls, I make use of a double hopper, F, Figs. land -one division for eachset of rolls. Sliding'gatesj'f, regulated by atljusting-screws j" f', are employ ed to vincrease or diminish the feed-aperture in the hopperbottom. These gates and slides, as well as the hoppers, may be ot' the usual or any desired-construction, and need not be described in detail, similar devices being in common use on roller-mills. Within the hopper are two swinging plates, I, (see Fig. 7,)-one for each set of rolls-which are pivoted by rods t' at or near the upper edge of doors F', which open into either side of the hopper. To one extended end of each of these rods is secured a hand-lever, i', for turning the plates I upon their pivots, and to the other end is secured a retlex or U-bar,1,on which is mounted a sliding counter-Weight, i2. This Weighted bar is set at such angle to the plane ot' plate I that its weight shall press the lower edge ot' the plate against the side ot' the hopper, as illustrated in Fig. 5, the degree'of pressure depending upon the position oi' the weight 2 on its bar. Also, by means of the reflex bend in bar I it is carried both sides of the vertical plane of the pivot-rod, aud thus provision is made for adjusting the weight to either side such plane, so as to make it operative in regulating the grain-supply, as described. Or, if

desired, in reducing light grain or meal the plate may be held down by the weight ont of the line of feed. This feature of improvement in balancing or overbalancing the plate in either direction I consider important.

In operation, grain or material to be reduced is fed to the hopper above the plates I, which will retain the grain until suficient weight hasaccumulated to overbalance the counter-weight i2, when the plates I Will be opened and a steady uniform run or stream ot' such material willpass to the rolls through the openings made by the adjustable plates ffat the bottom ot' the hopper. If it is desired to shut off the supply without disturb- IZO ing the adjustment of plates f, the lever 1I is pressed down and passed under a catch, i, Fig. 1, thus holding 'the lower edge of the plate I irmly against the side of the hopper, so as to close the passage. By the use of two regulators I secure a very uniform feed, and provide` for shutting off feed, when desired, without disturbing the feed-regulator nearest to the rolls. I am also enabled better to detect and remove hard substances, whichwould injure the our or the machine. Y t.

In order to prevent accumulation of meal upon the faces of the slow rolls, I make use of Scrapers R-one for each set of rollswhich are mounted within the case ofthe mill below the rolls, and are supported by vertical bars R', pivoted at their lower ends by rod R2 to the sides of the frame or the wooden 'case within the frame. Also,from arod, R3, above or below the pivot, a pull-rod, o,`i`s passed outward horizontally through the case, and through a metallic washer, o', which is fastened to the case on the outside, and so beveledion its faces as to (it the inclination of the case, and afford a full bearing for a handscrew, o2, which is run on the threaded end of rod o. `By turning the wheel the Scrapers may be set at any desired distance from the surface of the roll and there held rigidly, so that any substance adhering to the roll will be removed with certainty. By mounting these scrapers within the case below the rolls dust is prevented from escaping. Also, by extend- A ing the adjusting-rods outside the case the screws o2 are brought into convenient reach of the miller. I thus combine t-he advantages of inclosed Scrapers and those having an unyieldrounded faces adapted to fit the` curve in the bottoms of the grooves, substantially as @et forth.

2. The combination of pillow-blocks b, screwsubstantially as and for the purposes set forth. j

3. In a roller grinding-mill, the combination of pillow-blocks b," rods e, standards A3, cams e667, and the means, substantially as described, for inclosing and protecting the cams. .i et. 1n combination with the rolls and driving-belts of a roller grinding-mill, a tightenin g-pulley, H, endwise-movable bar h, carrying such pulley, spring h2, and adjusting-screw H', substantially as and for the purposes set forth.

5. In combination with counter-shaft pulley N, roll-pulleys N' N', and belt n, a tighteningpulley, H, in line between the pulleys N N and N, movable supporting-bar h, and adjusting-screw H', substantially as set forth.

6. In combination with the reducing-rolls and inclosing-case of a grinding-mill, a scraper, B, and pivoted supporting-arms It', mounted within the case below the rolls, a rod, o, extending from the scraper-support within the case to the exterior of the case, and an adjusting-screw, o2, on the threaded end of the rod outside of the case, substantially as and for the purposes set forth.

7. rIhe combination of hopper F, plate I, pivot-rod z', retlex bar I', extending on both sides of the vertical plane of the pivot-rod, and counter-Weight 2, adjustable on the reexbar to either side of such vertical plane, substantially as and for thepurposes set forth.

In testimony whereof I have hereunto set my hand.

OYRUS T. HANNA. Witnesses:

C. L. PARKER, S. HARVEY THOMPSON. 

